12% is a good amount you might not need to think about unless it reach 70% and still your VPS should be stable. Its really different than using 70% ram in a dedicated server where it starts to SWAP.
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I have a vps with linux and centos cpanel / whm I have 8 gigs of memory and a 8 core
question is my memory is currently at 12.00% when should i add more? like wait no longer then half?
Add more when you get close to swapping. It's very simple for your host to add more memory. However, if you have a Xen virtual private server you may want to ensure that they have extra memory available in the amount you want beforehand. It's possible that you could be hosted on a node for which they've allocated out nearly all of the memory.
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Most hosts will email out alerts when the RAM usage is high and the server needs more. If your host does not provide this service - like an above post has suggested - I would call your hosting provider and ask about the available resources on your host machine, ensuring that when you do need more RAM the allocation is there, a RAM upgrade on a VPS can be done quickly with a simple re-boot, but if it needs to move machine in order to allocate more resources this can cause downtime to the server (this highly depends on how many files are on it), so I would check with your host.